Freetag – an Open Source Tagging / Folksonomy module for PHP/MySQL applications: Found this via a trackback to my previous post about tagging. It’s a ready-made API for implementing a tagging system in your app.
Freetag is an easy tagging and folksonomy-enabled plugin for use with MySQL-PHP applications. It allows you to create tags on existing database schemas, and access and manage your tags through a robust API.
I love that name: folksonomy. It’s like flipping the bird at the darling of high-brow information architecture: the much-vaunted “content taxonomy” (which I’ve theorized is dying anyway).
Via Confused Kid (the name of the site, not an actual child).